<div class="bny-card">
    <div class="bny-card-header">
        表单
    </div>
    <div class="bny-card-body">
        <div style="width: 600px;max-width: 100%;">
            <form action="" class="bny-form">
                <div class="bny-form-group">
                    <label for="bnyInput1">input</label>
                    <input type="text" id="bnyInput1" class="bny-input" placeholder="文本框">
                </div>
                <div class="bny-form-group">
                    <label for="bnyInput2">textarea</label>
                    <textarea id="bnyInput2" class="bny-textarea" placeholder="文本框"></textarea>
                </div>
                <div class="bny-form-group">
                    <button class="bny-btn">提交</button>
                </div>
            </form>
        </div>
    </div>
</div>